Ore-roasting furnace.



s. PPAUL. ORE ROASTING FURNACE. APPLIOATIOH FILED NOV. 25, 1910.

I Patented Apr. 18. 1911:.

w/ TIIVEJSES CURT PFAUL, OF BLASEWITZ, DRESDEN, GERMANY.-

ORE-ROASTING FURNACE.

Application filed November 25, 1910. Serial No.594= ,130.

' To all whom it may concern:

Furnaces, of which the following is a sp ec1-" fication.

The invention relates to an annular mechanical roasting or'heatingfurnace for 1 blende, pyrite, waste or coloring-matter with helical bedand helical rake parallel thereto.

Reference is to be had to the accompanying drawings forming a part ofthis specification and in which the invention is shown. Figure 1represents a vertical section and Fig. 2 a horizontal section of thefurnace.

The novelty of the invention as compared with known types of annularmechanical roasting or heating furnaces with helical beds consists inthe fact that the framedike rakes b are carried by the rollers +cbeddedin the walls of the annular furnace -abeing thus moved parallel to thehelical bed. The vertical shafts cl and e upon which the rollers c' aremounted are so arranged in the walls of the furnace that the rollersthemselves are essentially situated. within the walls thereof, only apart of their.

' circumferencesextending into the interior in the frame simultaneouslysupported by at least three of the furnace and projecting into the waysThe frame b"- is of the rollers 0-. Byturning the rollers c ina givendirect-ion, by any suitable means, the rake and. the material to beroasted is. moved in a downward direction;

parallel to the surface of the helical base. The return movement of therake is accomplished in any suitable manner as, for example, byreversing the movement of the rollers. The special advantage of thiscon- .struction as compared with others is'that no iron parts remainconstantly in the heated interior of the furnace, for as the rollers.c'are in continual motion, each part of the circumference remainswithin the furnace only a very short time and at, once re turns into thecooler furnace-wall and there- Specification of Letters Patent.

Patented Apr, 18, 1911.

fore does not reach nearly so high a temperature as if it remained constntly within the .furnace itself. The shafts (Z and e of the rollers -oare themselves protected against the h1gh temperature of the furnace byreason of their being embedded in the wall thereof, and being moreoverconstantly revolving they do not always present'the same surface in thedirection of greatest heat. No part of the rake itself remains-constantly within the heat-zone of the furnace as it proceeds along thewhole bed from one end to the other. On reaching the end of its movementand coming there intoa relatively lower temperature which does notaffect the solidity of the. iron, it mayremain stationary awhile so asto keep it at a moderate temprotect it from wear and perature and sobreakage. v

The furnace can without difiiculty be constructed on a very large scale,thus making all parts easier of access and enabling it in case of abreak-down .inthe machinery to. be served by hand, which in many casesis imperative. I

Compared with those constructions in which the beds are arranged" invarious stages one above the other and in which the material treatedfalls from one stage to the other, the present invention possesses theimportant advantage of-avoiding the excessive dust occasioned thereby asthe mate rial. is nowhere freely precipitated. A

further advantage is that the rake does not pass outof the furnace as inmany other types of construction, the injurious effects of the entranceof air into,'or the exit of harmful gases from'the interior of thefurnace is excluded. As the up and down movement of the rake isaccomplished by purely mechanical means and as the whole of themachinery is extremely simple, the costs of working are much reduced.

Having thus described my invention, I claim as new and desire to secureby Letters-Patent:-

In an annular furnace, in combination, inner and outer walls, a helicalbed positioi ie'id Hem ken'saidwi zivllsi-trrake ildzrpte d. to na mefhothis specification in Elie prg sence 0f itravl along said-bed;'aplurality-off rollers two subscribing witnessa ,dfierzitiyeiy mountedwithinrsaid Walls, each of said rollers extending-inwardly from said'5f3va11s1 to enga'ge-sziidrakg; and; means for Witnesses:-

0tating said rollers. I v 1 'PAUL ARMS, In testmmnv wh'er'eof'l havesigned my CLKR -S IMON1.

